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Spatial Variability and Factors Influencing the Air-Sea N 2 O Flux in the Bering Sea, Chukchi Sea and Chukchi Abyssal Plain

机译：白令海，楚科奇海和楚科奇深渊平原空气海N 2 O通量的空间变异性和影响因素

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摘要

The concentrations of the ozone-depleting greenhouse gas nitrous oxide (N 2 O) in the upper 300 m of the Subarctic and Arctic Oceans determined during the 5th Chinese National Arctic Research Expedition were studied. The surface water samples revealed that the study area could be divided into three regions according to the distribution of dissolved N 2 O in the surface water, namely, the Aleutian Basin (52° N–60° N), continental shelf (60° N–73° N) and Canadian Basin (north of 73° N), with N 2 O in the surface water in equilibrium, oversaturated and undersaturated relative to the atmosphere, respectively. The influences of physical and chemical processes, such as eddy diffusion and sedimentary emissions, beneath the surface layer are discussed. The results of a flux evaluation show that the Aleutian Basin may be a weak N 2 O source of approximately 0.46 ± 0.1 μmol·m ?2 ·d ?1 , and the continental shelf acts as a strong N 2 O source of approximately 8.2 ± 1.4 μmol·m ?2 ·d ?1 . By contrast, the Chukchi Abyssal Plain (CAP) of the Canadian Basin is at least a temporal N 2 O sink with a strength of approximately ?10.2 ± 1.4 μmol·m ?2 ·d ?1 .
机译：研究了在第五次中国国家北极研究考察中确定的北极和北极海洋上部300 m中消耗臭氧的温室气体一氧化二氮（N 2 O）的浓度。地表水样品显示，根据溶解态N 2 O在地表水中的分布，研究区域可分为三个区域，即阿留申盆地（52°N–60°N），大陆架（60°N）。 –73°N）和加拿大盆地（北73°N），地表水中的N 2 O处于平衡状态，分别相对于大气过饱和和不饱和。讨论了表层下面的物理和化学过程的影响，例如涡流扩散和沉积物排放。通量评估的结果表明，阿留申盆地可能是约0.46±0.1μmol·m？2·d？1的弱N 2 O源，而陆架则是约8.2±8.2 N的强N 2 O源。 1.4μmol·m≤2·d≤1。相比之下，加拿大盆地的楚科奇深渊平原（CAP）至少是一个临时性的N 2 O汇，其强度约为？10.2±1.4μmol·m？2·d？1。

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